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Install a new Defrost Control Board and Single Pole Contactor for the Hallway Unit. Controls were removed from Hallway Unit to get Apartment 6110 system up and running. Test operation of system upon completion. Installed defrost board and contactor. Tested system in heating mode at 30 degrees outside temp. Pressures were 261/76. When we first turned on air handler burnt off dust collected on strip heat than checked temperature rise on hallway system. Temp rise was 19 degrees. System is working fine at time of service.